<template>
   <div class="todo-footer" v-show="isAll">
        <label>
          <input type="checkbox" :checked="AllTodo" @click="realeAll" />
        </label>
        <span>
          <span>已完成{{ doneTotal }}</span> / 全部{{isAll}}
        </span>
        <button class="btn btn-danger" @click="clealChecked()">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name:'MyFooter',
  props:['todos','checkAll','clearAll'],
  computed:{
    doneTotal(){
      return this.todos.reduce((pre,todo)=>pre+(todo.done?1:0),0)
    },
    isAll(){
      return this.todos.length
    },
    AllTodo(){
      return this.doneTotal ==this.isAll&&this.isAll>0
    }
  },
  methods:{
    realeAll(e){
      return this.checkAll(e.target.checked)
    },
    clealChecked(){
      return this.clearAll()
    }
  }
}
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>